IR-4 Ornamental Horticulture Program Cyprodinil and Fludioxonil Crop Safety and Efficacy

Transcription

1 IR-4 Ornamental Horticulture Program Cyprodinil and Fludioxonil Crop Safety and Efficacy Authors: Cristi L. Palmer and Ely Vea Date: April 27, 2010 Acknowledgements Lori Harrison Karen Sims J. Ray Frank 1

2 Table of Contents Table of Contents... 2 Table of Tables... 3 Abstract... 4 Introduction... 5 Materials and Methods... 5 Results and Summary... 5 Efficacy... 5 Phytotoxicity... 5 Label Suggestions... 9 Appendix 1: Available Protocols Appendix 2: Contributing Researchers Appendix 3: Submitted Data

3 Table of Tables Table 1. List of Medallion treated crops where more information is needed Table 2. List of Palladium treated crops where more information is needed Table 3. Detailed Summary of Testing with Medallion, Switch, and Vanguard

4 Abstract From 2000 to 2007, IR-4 researched crop safety and efficacy of Medallion (fludioxonil), Vanguard (cyprodinil), and Palladium (Switch 65WG, cyprodinil + fludioxonil). Medallion impact on 19 crops was tested, while 6 crops where studies with Palladium. Tests for efficacy included experiments on Botrytis cinerea, Phaeocryptopus gaeumannii, several Phytophthora sp, Sclerotium rolfsii var. delpinii, and Thielaviopsis elegans. 4

5 Introduction Cyprodinil and fludioxonil are fairly recent introductions into the US. Fludioxonil is registered under the trade name Medallion for ornamental horticulture uses. Cyprodinil is not registered for ornamental horticulture as a stand alone product due to concerns related to development of tolerance in key target fungi. To address resistance management, Palladium a combination product of cyprodinil and fludioxonil was developed. In addition to crop safety, IR-4 tested Medallion in a series of efficacy experiments for Botrytis cinerea, Phytophthora sp, and Sclerotium rolfii var. delphinii. Palladium was tested under the food use trade name Switch 65WG against Botrytis cinerea and Thielaviopsis elegans along with two trials for crop safety. Materials and Methods Medallion was applied as a drench or foliar application at 1, 2, and 4 oz per 100 gal. Palladium was applied as a foliar application at 3, 6, and 12 oz per 100 gal or a drench at 1.9, 3.8 or 7.5 oz per 100 gal. A minimum of four plants (replicate treatments) were required with most researchers exceeding this minimum. When efficacy was the target, different measures were used based on the disease and data were recorded at appropriate assessment intervals after initial application. Phytotoxicity was recorded on a scale of 0 to 10 (0 = no phytotoxicity; 10 = complete kill). For more detailed materials and methods, please see Appendix 1: Protocols, along with the researcher reports in Appendix 3. Medallion, Switch 65WG, and Vanguard were provided to researchers by Syngenta. Results and Summary Efficacy Medallion. Very little impact was observed on 4 different Phytophthora species and for Botrytis cinerea on Pelargonium x hortorum.. However, in one experiment Medallion did provide significant efficacy of gray mold on Douglas-fir comparable to Decree. Palladium/Switch 65WG. Similar to Medallion, Palladium provided good to great control of Botrytis cinerea on conifers, but it did not provide sufficient control in Pelargonium x hortorum. Palladium did reduce Thielaviopsis root rot in Pansy. Vangard. This product was tested solely on Phaeocryptopus gaeumannii and did not provide commercially acceptable control. Phytotoxicity In general, not enough trials were conducted with any of the products to be able to conclusively recommend listing any specific crop. However, with the exception of a single trial on Pseudotsuga menziesii and on Tsuga heterophylla with Medallion, no injury was observed. 5

6 Table 1. Abies sp. Allium moly Antirrhinum majus Crocosmia x crocosmiflora Delphinium sp. Dianthus sp. Festuca sp. Fragaria sp. Gerbera sp. Gladiolus sp. List of Medallion treated crops where more information is needed. Hemerocallis sp. Leucanthemum maximum Lilium sp. Pelargonium x hortorum Pseudotsuga menziesii Rhododendron sp. Tsuga heterophylla Verbena sp. Viola sp. Table 2. List of Palladium treated crops where more information is needed. Abies sp. Tsuga heterophylla Pelargonium x hortorum Viola sp. Thuja plicata 6

7 Table 3. Detailed Summary of Testing with Medallion, Switch, and Vanguard Notes: Table entries are sorted by crop Latin name. Only those trials with research reports received by 3/15/10 are listed below. Table entries with blank results have been received but not yet cataloged in the database. PR # Product Target Crop Latin Name Crop Cultivar Production Site Researcher Year Application Type Trial Results Medallion Botrytis cinerea Pelargonium x Greenhouse Hausbeck 2002 Foliar No significant impact on disease at 1, 2, hortorum and 4 oz per 100 gal under severe pressure; no injury Medallion Botrytis cinerea Tsuga heterophylla Field Container Lambe 2005 Foliar Significantly reduced low disease infection at 2 and 4 oz per 100 gal; comparable to Decree Medallion Phytophthora cinnamomi Medallion Phytophthora cryptogea Medallion Phytophthora nicotianae Medallion Phytophthora nicotianae Rhododendron sp. Gerbera sp. R. catawbiense 'Roseum Elegans' G. jamesonii 'Yellow Revolution' Field Container Benson 2004 Foliar No efficacy at 2, 4, and 8 oz per 100 gal. Greenhouse Benson 2007 Drench Extremely high disease pressure; no control at 2 oz per 100 gal Antirrhinum majus Greenhouse Hausbeck 2002 Drench Some initial reduction in disease, however very heavy disease pressure overcame this with 1, 2, and 4 oz per 100 gal; no phytotoxicity while plant were alive. Viola sp. V. x wittrockiana 'Matrix Purple' Greenhouse Benson 2007 Drench Moderately high disease pressure; virtually no control at 2 oz per 100 gal File Name d.pdf f.pdf h.pdf a.pdf b.pdf d.pdf Medallion Phytotoxicity Abies sp. Field Container Linderman 2002 Drench No injury at 2, 4, and 8 oz per 100 gal a.pdf Medallion Phytotoxicity Allium moly A. Field Container Linderman 1999 Drench No injury at 1, 2, and 4 oz per 100 gal a.pdf sphaerocephalon Medallion Phytotoxicity Crocosmia x Field Container Linderman 1999 Drench No injury at 1, 2, and 4 oz per 100 gal b.pdf crocosmiflora Medallion Phytotoxicity Delphinium sp. 'Double Special Giant Imperial Mixture' Field In-Ground Locke 1999 Drench No injury at 1, 2, and 4 oz per 100 gal j.pdf Medallion Phytotoxicity Dianthus sp. D. chinensis Field Container Linderman 1999 Drench No injury at 1, 2, and 4 oz per 100 gal c.pdf 'Carpet Snow' Medallion Phytotoxicity Festuca sp. F. ovina 'Glauca' Field Container Linderman 1999 Drench No injury at 1, 2, and 4 oz per 100 gal d.pdf Medallion Phytotoxicity Fragaria sp. 'Totem' Field Container Linderman 1999 Drench No injury at 1, 2, and 4 oz per 100 gal e.pdf Medallion Phytotoxicity Gladiolus sp. 'Nova Lux' Field Container Locke 1999 Drench No injury at 1, 2, and 4 oz per 100 gal k.pdf Medallion Phytotoxicity Hemerocallis sp. 'Joan Senior' Field Container Linderman 1999 Drench No injury at 1, 2, and 4 oz per 100 gal g.pdf Medallion Phytotoxicity Leucanthemum maximum Medallion Phytotoxicity Pelargonium x hortorum 'Little Miss Field In-Ground Locke 1999 Drench No injury at 1, 2, and 4 oz per 100 gal i.pdf Muffet' 'Orbit Hot Pink' Field Container Linderman 1999 Drench No injury at 1, 2, and 4 oz per 100 gal f.pdf 7

8 PR # Product Target Crop Latin Name Crop Cultivar Production Site Researcher Year Application Trial Results File Name Type Medallion Phytotoxicity Pseudotsuga Greenhouse Lambe 2002 Drench Very slight needle chlorosis at 8 oz per e.pdf menziesii 100 gal and slight to severe stunting increasing with rate (2, 4, and 8 oz per 100 gal) Medallion Phytotoxicity Pseudotsuga Greenhouse Linderman 2002 Drench No injury at 2, 4, and 8 oz per 100 gal f.pdf menziesii Medallion Phytotoxicity Tsuga heterophylla Greenhouse Lambe 2002 Drench Moderate chlorosis at 2, 4, and 8 oz per g.pdf 100 gal with moderate to significant stunting and stem swelling increasing with rate Medallion Phytotoxicity Verbena sp. 'Homestead Field Container Linderman 1999 Drench No injury at 1, 2, and 4 oz per 100 gal h.pdf Purple' Medallion Phytotoxicity Verbena sp. 'Romance Field In-Ground Locke 1999 Drench No injury at 1, 2, and 4 oz per 100 gal l.pdf Medallion Sclerotium rolfsii var. delphinii Switch 62.5WG Switch 62.5WG Switch 62.5WG Switch 62.5WG Switch 62.5WG Switch 62.5WG Switch 62.5WG Switch 62.5WG Vangard 75WG Botrytis cinerea Botrytis cinerea Scarlet' Lilium sp. 'Jolanda' Field In-Ground Chastagner 2000 Band infurrow before hilling Pelargonium x hortorum Pseudotsuga menziesii Some reduction of Sclerotium delphinii crown rot at 0.04, 0.75, and oz ai per 1,000 ft of row; no impact on plant height or other injury. P. x hortorum Greenhouse Hausbeck 2002 Foliar No consistent impact on disease with 3, 6, and 12 oz per 100 gal; no injury observed. Greenhouse Lambe 2000 Foliar Good control of a low infection at 3, 6, and 12 oz per 100 gal per acre; no phytotoxicity. Botrytis cinerea Pseudotsuga menziesii Greenhouse Lambe 2001 Foliar Good control at 3, 6, and 12 oz per acre; no injury. Botrytis cinerea Tsuga heterophylla Greenhouse Lambe 2000 Foliar Good control of a low level infection with 3, 6, and 12 oz per 100 gal with 100 gal per acre; slight chlorosis of lower needles at 6 and 12 oz per 100 gal. Botrytis cinerea Tsuga heterophylla Greenhouse Lambe 2001 Foliar Great control with 3, 6, and 12 oz per acre; no injury. Chalara elegans Viola sp. Greenhouse Hausbeck 2002 Drench Some reduction of disease as based on health rating at 1.9, 3.8 and 7.5 oz per 100 gal; no injury c.pdf b.pdf a.pdf c.pdf b.pdf e.pdf f.pdf Phytotoxicity Abies sp. A, procera Greenhouse Linderman 2001 Foliar No injury at 3, 6, and 12 oz per acre a.pdf Phytotoxicity Thuja plicata Greenhouse Linderman 2001 Foliar No injury at 3, 6, and 12 oz per acre d.pdf Phaeocryptopus gaeumannii Pseudotsuga menziesii Field In-Ground Chastagner 2002 Foliar No impact on disease and no injury g.pdf 8

9 Label Suggestions IR-4 has not collected sufficient information on Medallion or Palladium to recommend label language. 9

10 Appendix 1: Available Protocols 10

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18 Appendix 2: Contributing Researchers Dr. Mike Benson Dr. Gary Chastagner Dr. Mary Hausbeck Dr. Robert Lambe NC State University Dept. of Plant Pathology 840 Method Rd. Unit 3 Raleigh, NC Washington State University Research and Extension Center 7612 Pioneer Way East Puyallup, WA Michigan State University Dept. of Plant Pathology 140 Plant Pathology Building East Lansing, MI Lambes Consulting PO Box Port Ludlow, WA Dr. Bob Linderman (retired) Dr. Jim Locke Horticultural Crops Research Lab USDA-ARS 3420 NW Orchard Ave. Corvallis, OR ATRU Univ of Toledo, GPRG USDA-ARS 2801 W. Bancroft St., Mail Stop 604 Toledo, OH

19 Appendix 3: Submitted Data Researcher reports included in the printed copy of this report are those received by 3/15/2010. Reports on following pages are in alphanumeric order of author and PR number. 19